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It is also known as Schorl and is a style of silicate crystal. It is commonly found in trigonal crystal systems and is made up of Sodium Iron Aluminum Borate Silicate. The stone is black. Black Tourmaline means grounding and protection. Many hold tourmaline healing crystals over the body's chakras to clear the aura, remove blockages, break up negative energy, and point to specific problems that one may be carrying.